Sounds easy, doesn't it? Flawed logic. Wrist weights will not build shoulders etc. They are too light to provoke any type of adaptation (other than some local functional endurance)
There is NO easy way - lift heavy and hard.
Wearing weighted belts, bands, straps etc as part of your daily routine would have more perils than you think, in that it would alter your normal movement patterns as you adjust and adapt factors such as your walking gait, static balance etc because of the increase in weight, putting greater stresses and strains on muscles and joints at weak biomechanical points, that could lead to injury.
During weight
training sessions although the lifts are not "normal" as such, you are in a safe position to lift - focused maximal intensity in a secure,supported, balanced body position.